libgui/SF: Fix some code warnings

A couple of fixes to satisfy the Eclipse static code analysis tool.
- Initialize all members in constructors
- Remove unused forward declarations
- Add parentheses when combining logical and bitwise operators
- Fix a case statement with no break (it was intentional)

Change-Id: Icecb8cc98c6f58b97ab33fffb621f0edc33a7d3c
diff --git a/libs/gui/tests/SurfaceTextureMultiContextGL.h b/libs/gui/tests/SurfaceTextureMultiContextGL.h
index 7934bbc..3cca035 100644
--- a/libs/gui/tests/SurfaceTextureMultiContextGL.h
+++ b/libs/gui/tests/SurfaceTextureMultiContextGL.h
@@ -27,7 +27,8 @@
     enum { THIRD_TEX_ID = 456 };
 
     SurfaceTextureMultiContextGLTest():
-            mSecondEglContext(EGL_NO_CONTEXT) {
+            mSecondEglContext(EGL_NO_CONTEXT),
+            mThirdEglContext(EGL_NO_CONTEXT) {
     }
 
     virtual void SetUp() {